Merge pull request #19 from p0358/main

Big refactor of launching process

1 files changed, 137 insertions, 0 deletions

diff --git a/loader_wsock32_proxy/dllmain.cpp b/loader_wsock32_proxy/dllmain.cpp
new file mode 100644
index 00000000..0b518dbe
--- /dev/null
+++ b/loader_wsock32_proxy/dllmain.cpp
@@ -0,0 +1,137 @@
+#include "pch.h"
+#include "loader.h"
+
+#include <Shlwapi.h>
+#include <filesystem>
+
+HINSTANCE hLThis = 0;
+FARPROC p[857];
+HINSTANCE hL = 0;
+
+bool GetExePathWide(wchar_t* dest, DWORD destSize)
+{
+	if (!dest) return NULL;
+	if (destSize < MAX_PATH) return NULL;
+
+	DWORD length = GetModuleFileNameW(NULL, dest, destSize);
+	return length && PathRemoveFileSpecW(dest);
+}
+
+wchar_t exePath[4096];
+wchar_t dllPath[8192];
+wchar_t dllPath2[4096];
+
+BOOL WINAPI DllMain(HINSTANCE hInst, DWORD reason, LPVOID)
+{
+	if (reason == DLL_PROCESS_ATTACH)
+	{
+		hLThis = hInst;
+
+		if (!GetExePathWide(exePath, 4096))
+		{
+			MessageBoxA(GetForegroundWindow(), "Failed getting game directory.\nThe game cannot continue and has to exit.", "Northstar Wsock32 Proxy Error", 0);
+			return 1;
+		}
+
+		if (!ProvisionNorthstar()) // does not call InitialiseNorthstar yet, will do it on LauncherMain hook
+			return 1;
+
+		// copy the original library for system to our local directory, with changed name so that we can load it
+		swprintf_s(dllPath, L"%s\\bin\\x64_retail\\wsock32.org.dll", exePath);
+		GetSystemDirectoryW(dllPath2, 4096);
+		swprintf_s(dllPath2, L"%s\\wsock32.dll", dllPath2);
+		try
+		{
+			std::filesystem::copy_file(dllPath2, dllPath);
+		}
+		catch (const std::exception& e)
+		{
+			if (!std::filesystem::exists(dllPath))
+			{
+				swprintf_s(dllPath, L"Failed copying wsock32.dll from system32 to \"%s\"\n\n%S", dllPath, e.what());
+				MessageBoxW(GetForegroundWindow(), dllPath, L"Northstar Wsock32 Proxy Error", 0);
+			}
+		}
+		hL = LoadLibraryExW(dllPath, 0, LOAD_WITH_ALTERED_SEARCH_PATH);
+		if (!hL) return false;
+
+		// load the functions to proxy
+		// it's only some of them, because in case of wsock32 most of the functions can actually be natively redirected
+		// (see wsock32.def and https://source.winehq.org/WineAPI/wsock32.html)
+		p[1] = GetProcAddress(hL, "EnumProtocolsA");
+		p[2] = GetProcAddress(hL, "EnumProtocolsW");
+		p[4] = GetProcAddress(hL, "GetAddressByNameA");
+		p[5] = GetProcAddress(hL, "GetAddressByNameW");
+		p[17] = GetProcAddress(hL, "WEP");
+		p[30] = GetProcAddress(hL, "WSARecvEx");
+		p[36] = GetProcAddress(hL, "__WSAFDIsSet");
+		p[45] = GetProcAddress(hL, "getnetbyname");
+		p[52] = GetProcAddress(hL, "getsockopt");
+		p[56] = GetProcAddress(hL, "inet_network");
+		p[67] = GetProcAddress(hL, "s_perror");
+		p[72] = GetProcAddress(hL, "setsockopt");
+	}
+
+	if (reason == DLL_PROCESS_DETACH)
+	{
+		FreeLibrary(hL);
+		return 1;
+	}
+
+	return 1;
+}
+
+extern "C"
+{
+	FARPROC PA = NULL;
+	int RunASM();
+
+	void PROXY_EnumProtocolsA() {
+		PA = p[1];
+		RunASM();
+	}
+	void PROXY_EnumProtocolsW() {
+		PA = p[2];
+		RunASM();
+	}
+	void PROXY_GetAddressByNameA() {
+		PA = p[4];
+		RunASM();
+	}
+	void PROXY_GetAddressByNameW() {
+		PA = p[5];
+		RunASM();
+	}
+	void PROXY_WEP() {
+		PA = p[17];
+		RunASM();
+	}
+	void PROXY_WSARecvEx() {
+		PA = p[30];
+		RunASM();
+	}
+	void PROXY___WSAFDIsSet() {
+		PA = p[36];
+		RunASM();
+	}
+	void PROXY_getnetbyname() {
+		PA = p[45];
+		RunASM();
+	}
+	void PROXY_getsockopt() {
+		PA = p[52];
+		RunASM();
+	}
+	void PROXY_inet_network() {
+		PA = p[56];
+		RunASM();
+	}
+	void PROXY_s_perror() {
+		PA = p[67];
+		RunASM();
+	}
+	void PROXY_setsockopt() {
+		PA = p[72];
+		RunASM();
+	}
+}
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